求助:itemchanged事件里面(dwo.Name)为什么报错?

[tomorrower]

求助:itemchanged事件里面的代码:目的是某些特定的字段改变的时候作一些事情,但是报错:代码如下

//修改招标价格后保存
string ls_col_name
ls_col_name = (dwo.Name)

If ls_col_name = 'zbsj_zbje' Or ls_col_name = 'zbsj_wxxz' Then

错误信息:NULL object reference at line 3 in itemchanged of dw_3

[kenshu]

ls_col_name = string(dwo.Name)

[SKY_4K_PPM]

原因很简单，就是你有时候单击点中的对象或许是一条线或者是其他的对象的话 dwo.name是无效的.
itemchanged事件添加代码：
if dwo.name<>'zbsj_zbje' and dwo.name<>'zbsj_wxxz' then return
................

[yyoinge]

//修改招标价格后保存
if not isvalid(dwo) then return
string ls_col_name
ls_col_name = (dwo.Name)

If ls_col_name = 'zbsj_zbje' Or ls_col_name = 'zbsj_wxxz' Then

[fuxiaoyang13]

dingding!!

[iuu54321]

学习！

[yyoinge]

[Quote=引用 3 楼 yyoinge 的回复:]

//修改招标价格后保存
if not isvalid(dwo) then return
string ls_col_name
ls_col_name = (dwo.Name)

If ls_col_name = 'zbsj_zbje' Or ls_col_name = 'zbsj_wxxz' Then
[/Quote]
错啦，应该是

//修改招标价格后保存
if isnull(dwo) then return
string ls_col_name
ls_col_name = (dwo.Name)

If ls_col_name = 'zbsj_zbje' Or ls_col_name = 'zbsj_wxxz' Then

[PB菜鸟]

[Quote=引用 5 楼 yyoinge 的回复:]
引用 3 楼 yyoinge 的回复:

//修改招标价格后保存
if not isvalid(dwo) then return
string ls_col_name
ls_col_name = (dwo.Name)

If ls_col_name = 'zbsj_zbje' Or ls_col_name = 'zbsj_wxxz' Then

错啦，应该是

//修改招标价……
[/Quote]
学习 。

[iuu54321]

哦，原来错啦，那就再学习一遍！

[srj911]

PB还是简单的